<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button>开启</button>
    <button>停止</button>
    <script>
        const btns = document.querySelectorAll("button");
        let setInterval1;

        btns[0].addEventListener("click", function () {
            setInterval1 = setInterval(function () {
                console.log("开始");
            }, 1000);
        });

        btns[1].addEventListener("click", function () {
            clearInterval(setInterval1);
            console.log("停止");
        });
    </script>
</body>

</html>